No Adapter for Active Survey

This happens because Ekahau Site Survey treats the very first network adapter it sees, as a passive scanner. In the above screenshot, you can see there is only adapter recognized by the software, and that is the internal network adapter of the machine.

In order to do an active survey, you need another adapter, i.e. a USB adapter, which will then take the role of the passive scanner and then the internal adapter can now be used for active surveying i.e. ping or throughput.